IACR News item: 13 April 2012
J.H.Zhang, Y.B.cui
ePrint Reportprimitive. It can protect the privacy of the receiver. In 2010, Fan
\\emph{et al} proposed an anonymous multi-receiver ID-based
encryption by using Lagrange interpolating polynomial. Recently,
Wang \\emph{et al} showed that Fan \\emph{et al}\'s scheme satisfied
anonymity of the receivers. Then they provided an improved scheme to
fix it and showed that the improved scheme was secure.
Unfortunately, we pointed out that Wang \\emph{et al}\'s improved
scheme did\'t satisfy the receiver\'s anonymity by analyzing the
security of the scheme yet. After analyzing the reason to produce
such flaw, we give an improved method to repair it and show that our
improved scheme satisfies the receiver\'s anonymity.
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